A049771 - OEIS

A049771

Triangular array T read by rows: T(n,k) = (k^4 mod n) + (n^4 mod k).

0, 1, 0, 1, 2, 0, 1, 0, 2, 0, 1, 2, 2, 2, 0, 1, 4, 3, 4, 2, 0, 1, 3, 5, 5, 3, 2, 0, 1, 0, 2, 0, 2, 4, 2, 0, 1, 8, 0, 5, 5, 3, 9, 2, 0, 1, 6, 2, 6, 5, 10, 5, 6, 2, 0, 1, 6, 5, 4, 10, 10, 7, 5, 12, 2, 0, 1, 4, 9, 4, 2, 0, 3, 4, 9, 10, 2, 0, 1, 4, 4, 10

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

G. C. Greubel, Rows n = 0..100 of triangle, flattened

EXAMPLE

Triangle begins as:

1, 0;

1, 2, 0;

1, 0, 2, 0;

1, 2, 2, 2, 0;

1, 4, 3, 4, 2, 0;

1, 3, 5, 5, 3, 2, 0;

1, 0, 2, 0, 2, 4, 2, 0;

1, 8, 0, 5, 5, 3, 9, 2, 0;

MAPLE

seq(seq( `mod`(k^4, n) + `mod`(n^4, k), k = 1..n), n = 1..15); # G. C. Greubel, Dec 16 2019

MATHEMATICA

Table[PowerMod[k, 4, n] + PowerMod[n, 4, k], {n, 15}, {k, n}]//Flatten (* G. C. Greubel, Dec 16 2019 *)

PROG

(PARI) T(n, k) = lift(Mod(k, n)^4) + lift(Mod(n, k)^4);

for(n=1, 15, for(k=1, n, print1(T(n, k), ", "))) \\ G. C. Greubel, Dec 16 2019

(Magma) [[Modexp(k, 4, n) + Modexp(n, 4, k): k in [1..n]]: n in [1..15]]; // G. C. Greubel, Dec 16 2019

(Sage) [[power_mod(k, 4, n) + power_mod(n, 4, k) for k in (1..n)] for n in (1..15)] # G. C. Greubel, Dec 16 2019

(GAP) Flat(List([1..15], n-> List([1..n], k-> PowerMod(k, 4, n) + PowerMod(n, 4, k) ))); # G. C. Greubel, Dec 16 2019

CROSSREFS

Cf. A049772.

Sequence in context: A365921 A086713 A275730 * A352514 A158944 A156663

Adjacent sequences: A049768 A049769 A049770 * A049772 A049773 A049774

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling

STATUS

approved